After administering PRN pain medication, which task can the nurse assign to the AP?

Documenting the client's respiratory rate after the administration of PRN pain medication is an appropriate task to delegate to an Assistant Personnel (AP). This task typically involves measuring and recording vital signs, which falls within the scope of practice for an AP. Monitoring the respiratory rate is important, especially after pain medication has been administered, as certain pain medications can affect respiratory function.

While the other choices involve assessing, evaluating, or making clinical judgments about the client's condition and response to medication, which are more complex tasks requiring nursing skills and knowledge, documenting a specific vital sign is straightforward. This allows the nurse to focus on higher-level assessments that require professional expertise while ensuring that the client's vital signs are still monitored and recorded in a timely manner.